Use the Compare tab to mathematically and visually annotate the difference between an image and its reconstruction. Choose a metric and press the compare button. A difference image is returned where the red areas of the difference image emphasizes (highlight) pixels that are modified and white de-emphasizes (lowlight) pixels that are untouched. In addition to the visual interpretation of the difference in an image and its reconstruction, we report a mathematical measure of the difference:

Distortion: 1606.1454808853 (0.0245082090621088)

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